2. Hela (Thor: Ragnarok)
Hela in Thor: Ragnarok really scared me when she made her entrance into the MCU. Right off the bat, she showed just exactly how powerful she was by destroying Mjölnir. She then followed that up by killing the Warriors 3 and slaying all of Asgard’s army. In terms of making an entrance, no villain has done it like Hela did.
As the Goddess of death, she is one of the most powerful villains in the MCU. With the ability to manifest weapons from her body, she drives up her kill count to unthinkable numbers. She’s so strong that she dispatched Thor multiple times, even after he learns to use his lightning powers. Hela, no question is my second favorite villain to ever hit the Marvel Cinematic Universe.